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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96552042b12300cb16198fca2fbe3eb0bfeaa388ee6dc17480258c9c7ab4df3' 
  AND token = 'pmREWfv/9vWwEi3PU8dc9UO3D4r8KaQcIOm4akIdkyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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