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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a71d64ce6fb9168a4781c8822a932daa4e550abaa00f18f32aa1ea17eb32d7' 
  AND token = 'r6u0j2rnhGRqeu86t3bgiO8QE/qhnzbRZE9b1y7Q+uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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