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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91dda1ac3c3e5d5eafdf093f7d927fa88f274ec44221ff4f3ee41dd459a1945' 
  AND token = 'jFfn2t/OyfkHSjaMgZsuBQHYSlf3nySfPQzbuR9hQho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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