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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eec73aa7eaca643aaa9926a2e972d87f19044b78d15a1d5454db9894613a0b8' 
  AND token = 'f23bqABEpRciU7gqTOPHyDlzv+maYDoRA+5weFgpuog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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