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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c6331508f5224f4cd15e2ccafbd46fe85c0f1bd19080cf03fd00d113b782de' 
  AND token = 'vx7FMHqmHFxKceOB7kj4/g3cg+2dos9FrldzuCn87jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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