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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878e4497380bae5023154a624b6d203888c0b890e5f49b1e4c6d9ce5f4fcfd31' 
  AND token = 'hV7tofsNbjsV4HEtnbXs9b4sKvhMzbWTgsO4SYRS2jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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