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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c50a9a35a75c6f4c57bd7d590d209b81e3a1cb089d8a5c1b7683e4dce703d6' 
  AND token = '2boESJIMA9mwgdYEHyJdG+r12ZgV/I71YIgoO6ijPFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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