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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20c74ebce824ffc25ecc590235f15ed6fe65a721765cf14feba0fd04639f5dc' 
  AND token = 'KyO6nmF41w4c3i5tWmetLVwy0ymMLUaosrruTSAT0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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