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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd920e980983072de473f518b5bbd07d3842d364513a9026380d0069b4c7adbc' 
  AND token = 'fwoO/l5t+fFWesh8+q0W/pCql9TDXfZq2q1j32/3LmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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