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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b9448e43d40737b0891ac121ec1079d0d29452833c35e9f27793e7eb06537e' 
  AND token = 'HQPnMG8Hzu3ck4o7EKAbUzgoZfRlOLM6OtvyPHVW4jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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