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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2797218e7a302ffe8326972494321e3d0e2d0b5acb2db1a71e1116049c4fda' 
  AND token = 'BIikVTCe8wN1Xw88ZtejgZGehFKYQQH12eptJYkyw74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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