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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dde119eb93d420886a2ff31a44d3a816f9d1050ad359163ca8e71606bd28c7' 
  AND token = 'NK1GHDnCHLVHwSe0Oq7vIGSD0ggttjSCRouEBk6y1cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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