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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f2bc729c90c63512048258480ab4f88b367da396940bc97026bc193c999005' 
  AND token = 'c1p2FeZC/nsla1mTo0wcOp66ad/6mWURAvFzFFJvKaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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