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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef22f48e7f13675fdd03ad9a65e58927db0e1eec3b1f693d28e244f5ef6cb04a' 
  AND token = 'elVqSXB3djGWz62r767diHKdCQ26u5b3VpbTpXcIJo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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