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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa65a44564401eed249fff7bf0084997e5102d739aa383d889d34a525c59067' 
  AND token = '3M/GG9KrQOtypS/60ErGF7auqiVPQfV9+Z9yvnkQAVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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