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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9bfc15ca7144593a0b5bbe9504531a99e25221933ab5a86a2c72d23c96c11f' 
  AND token = 'dvXEB2cZFSZwMudyBdemEpaukTQC1MN7ChviBa4IURM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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