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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705ab0b34983257854277547e57c7424a5aca2e791861e449574380f035527e0' 
  AND token = 'QtTF0kHp+Qo/8dvwLyIbvtlxG7p1KmXg0M0u94dpKEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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