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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095b9ea99ff0fd98d271a9c289d41d96796a496d1841d2a1a060ed5e43efb2a0' 
  AND token = '/+4iKN0HkDMDSUCZVL1uQNIj8CEzlCsMbrzOXpqmE3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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