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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6188cea5419b5ef9e07699b0f25e4878864de1dee7a306af1823b6c3f3c94d' 
  AND token = 'q4b0q43BgutDJ+n2c2LA7DekegeG0+uFRDvw4xA4mfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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