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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014c5adcf6bf2c415fae59dc3cd8a9531a21b52b801c95efa330b689e0c8c0fd' 
  AND token = 'rON9gNmlclhrFnIe0xeSysrC7f33XrrmK8EUI5RR9j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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