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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f46c1799ece93e89409410886ed3f14f6e09fd8f5df68de5bf0a74f4fda6d7' 
  AND token = 'jyFj5XtqThzD/WvON4Yto83t04LFvI+35h7A8W4alA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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