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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97ac202ca9729864e4737a4cad7ed486e59f0a5ac5226c1bbc027bfaa1dd987' 
  AND token = 'qU+10n68X8jTZh4xAcbX5r/0oc7UrjBpILUUpI2NWRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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