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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09900d14600f980ef63f61e80abb1be18567b65d72ca73b8b4635a9e46594250' 
  AND token = 'FwUXkHVlsgawowTxvAus0TKVYm6Xv/TyoPE5yMoKAFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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