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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77a1933ddb3ec27e8868dac75c628c4f4b1212e8507e6e0b156c0e85f04299d' 
  AND token = 'mZv7u2LOsl1dUjBkt+P8yziuN2c/y2H3NyhqqOkhtPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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