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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69046f835df5f965bb8ae98485e4da502d3f4746a1c4a01cf9760e9dc9a7f471' 
  AND token = 'rB2ZY0Q6dh/Y+0Lrco5MvFil5nRY4rWLlSYL3rhrtjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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