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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66211628ea5ee0c36834564ddb17ca310c11897d26a430d92f45b72874b1a4a' 
  AND token = 'u48oy0yfICi62QB98DOy5UEL+Djx+cwkmAA5PFpcjDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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