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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772cf28387f25b9bb64d4d1ec0eabf9694235acfbc726a339d3269f47acf15d4' 
  AND token = 'e+Ljnr4iN4ggdG0pzSKPtLis0Xys4ZSe2O5vp+G62Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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