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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4818e4767d16330da301f1bd7caf6734c8ef7e60b869e24c853efc93cf41f6d' 
  AND token = 's8og+xJ0w9KUdy4OmXedZ93Rqh445K9LzTeVE2cyRu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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