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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d7fc74e53ed469136f7e14f6b173c1ccc3bb1f0a13fd4b839a9f6a8bf68028' 
  AND token = 'CjTPNBA9KU1t5DxObrXxJ9o2C8c5wLr6S0UYw+cQFV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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