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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be889a11f767dbf0fab72e5a723ea1e7a93c382d8fc9b04980b68e299a2cbd3' 
  AND token = 'S2Cz+pVnR+FMJLRrJLgmQ9oKDGiyO4flGkAGUMOVfPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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