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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd492af9533585a076b9e73434c0682c90a001200d616c842d3ba370497e14c5e' 
  AND token = 'fgXv3xSIHhzdeEq4oI+agjIAsSZ/su2dYIR8Mfd9fw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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