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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1382fcae5871bd84535c9edd9c963b2b5c548f2daaa9b670ac50365f48d878a' 
  AND token = 'sondKYQPyLbmTuQWs/ILdAO8nvxqN7E6S7fSUNx87Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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