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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad0e7607b067794034c3e1c5518436e8978a7c64a4f5bc4b7aaaaf0edc3c51a' 
  AND token = '77X+DeKg2ikvKi1lsnx5Mwl7iaXhUwezCu+DxtRL+L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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