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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271e575b93bc595634ae126f5d38941a363b0dc0e1e89e831a0ff7d3db473d02' 
  AND token = '+nd+QkKE8cM2vDFEJSG0uF3qBfiCu1WE0co2J+1kSCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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