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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176439a14c6f2f8ee7931a886084cfddda725f37c7acb593e682395a36e4baa0' 
  AND token = 'XMpUIgWkC7Hi59B7eUsBysaZAlG1XvuZNa6IEMx3Qs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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