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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e714a408e8acbf03a4a813e3bb07741a04debe90fd143d9a5842b29d2d2ca8c4' 
  AND token = 'lm+nCbxE98N8RBv6H2CypquSv+l5CWb+a1hvyi7JQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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