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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41606b182d1e88577515bbe0efcb39cc45435c9599bcdf7c6b59a1fc8e9438ff' 
  AND token = '8tne2IQdpsLVUD60D9q4Jt710+3toe+4/eNH4tOi/vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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