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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9800605b26e1a3e55da98ebf9f1e4c9a45451342e1efb8f103a61958642ef6' 
  AND token = 'zYovacPSfY4i0CGaByixglr2d+pORRu4iezPH4bKk7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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