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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d9bf97df11c6a160b68988dcf4dd956b79e455de8ff99dc7f357b912e067b7' 
  AND token = 'KTJeTFF8hXconky/VJAbkthVwygXzQDnW2s3h1UBc30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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