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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206b5aef643f9eac6cf7a9fc1d227a6283cb7a12b0056f021cdf6f4e3a0df8a7' 
  AND token = 'gFt+osDyhuaE+4q+XpMrNCKbVJn0Kn/9sBboXKSbh4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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