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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c09b9397f6176b1b8224d3b76c6b73f0bdcfd7535768e590fd2af986e06fec8' 
  AND token = 'sqpeDOQoRayJkO/uIdiiGuXWvErhR3kUi34kqA8GC/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}