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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ad273435d1ff942d8dea32bbc99ec390acf60b2708e5a4130a4f5885df6532' 
  AND token = 'FCLb8CaKABQqFfSU8EvtkDN6w8XNWu56fCmmJp45Ovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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