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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75585e30ca98f045ffa360f049da3b4b7119bc98b832dcbe81b9792267b20d2b' 
  AND token = 'ont3IahQ2CO1xjl28cJ8FUijQqYmUncj79v6tI142c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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