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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987d58c48d6780d1f84bb0eb94931879a85d30714f8e8e8d80382ff322cc7857' 
  AND token = 'NcwXgBcyOI4GfOR9S3gQ0W+/dQZ4Nue3w5jbwHRP90A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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