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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d8062713659cc0284c657c64b9f03a9fb9cc3124886bc381c0a1dfcde821fc' 
  AND token = 'eiQyAbC/p6wPbLRXKn2BS5Gap0E1MTU79m6etJlPwTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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