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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ccf479e34300c5d24f304207ae51200416158f08ca9ac87b59f6344a5f389c' 
  AND token = '/40VRRyUbwMMOkHIJDFPVosh9JP7ZSDr5uXUcbrANjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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