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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d9031fe8dd89f189c468ba6347a6752351f04f384085f43e05f3794eb7987c' 
  AND token = 'H2dOOqxBxB8pLrbSKM/eSC2jcaT8fVxhKwzpsy2M7r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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