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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e09b8901f85b80fc9730c1d21214989170dc560b6a889a874f32b8d8b1827d' 
  AND token = 'oJ3Cow1MBxFg9l7URBvvKaEthO0Ho1dk5JcbSiKWIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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