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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbf6330e21b88ad81c62b4df655090f47a6de4c69dcfd2109e8b32eeb3ba814' 
  AND token = 'UX/IP7orfX8RblQ9UNMANSs2ptAR+nMGX25Sd4SFMPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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