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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c437342df7fec9fa1484e941d29ec53025e7240339151e14ceb3da69e694f80' 
  AND token = 'yro/sxqyskqAUzlEAx2FD+tyz9yB7TGOllZZtunUCSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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