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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e914f1a70ca9ee4179c9c70016e3d37751929a55ae0c2e95724ace688484eff2' 
  AND token = 'jZXzLezfD4SbrxLo4fvR0krbcRN9Yiob+1MqVJA4KtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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