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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d3361adb0a7ebe1bbdac5df416ad3762a26edb8e087dfa6ca6d4a4c9977c52' 
  AND token = 'KoiuUSVXde2S9oMLlS26VWtVlzrGFh4grRHLAJIjc6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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