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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fa22288a8f6116dd2885e102b5aefdeab413e9bb50dc27c1728f78bbdd1b43' 
  AND token = '1oW7q7joGk8dFiMUVNIFmnKRWIEepqcEqWL10WuElX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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