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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd18f9f85e3fbd7a492643bbccc506cef1011de5c82fc44e8336a62aaad4ab5' 
  AND token = 'liEVh75rCNtOnfjxnz2qZ4GkpRbEeUT3s89G/PcGmc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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