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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6901e283d9bd1a61eb9a5c15e7e1658a78740fab3a7c80def928bfcf2439f1b0' 
  AND token = '8nP+4Bl4t8fVBMi0fHl4BrFSm9OXPvoQs5IpmZYDk2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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