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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167786a63aab5d72f7ca75cbc33ea9e09cf58dceb5a355df5620c08dd31d69c1' 
  AND token = 'QkL7CyJ2OxWTqGhaL+4VsMK2KhC0uPAEVTo2IlD2Cv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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