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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a3efd415c1b53a9455f11c9b57367a06295b2e351cd49d34b988396548ce58' 
  AND token = '0L/EDu4kZp3UGuWem7JgW1xNZ7LdKOpRoClwD4/VeNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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