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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1f595d7900cfc47a8b585d17de528a1439de4f4c499620b401df799a1ea0dd' 
  AND token = 'VpC2n4RttoLzBuabHcF0vDJMXhFVPfTogw6RNswUZhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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