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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf047622173811a9d5b8fb02fa91bd3f35442c3d0d617644ef70cfe890be683' 
  AND token = 'Nd4/M1xkL9A2ReYYn4X3ewMzu/qQLNeHl3mXR9Kb+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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